Fixed mandrel (one per size) for radii equal and/or superior than 2,5D and with pipe’s wall-thickness over 2mm. On the mandrel there is a longitudinal groove made appositely to put in the eventual pipe’s bead.
Articulated mandrel (one per size) for radii inferior to 2.5D and pipe’s wall-thickness less than 2mm.
Mandrel with balls (one per size) for radii inferior than 2.5D and with pipe’s wall-thickness less than 2mm. Ideal for very thin wall pipes and with bending radii 2D.